# Physics

A 1500 kg car traveling at 100 km/h west collides with a 1200 kg car traveling east at 85 km/h. The heavier car slows to 25 km/h after the collision. How fast is the lighter car traveling after the two cars collide?

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1. 100km/h = 100,000m/3600s = 27.8 m/s.
85km/h = 85,000m/3600s = 23.6 m/s.
25km/h = 25,000m/3600s = 6.94 m/s.

M1*V1 + M2*V2 = M1*V3 + M2*V4.
1500*(-27.8)+1200*23.6=1500*(-6.9)+1200V
Solve for V.

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